NAC and GlyNAC has 3 documented interactions in Magellan’s curated dataset, covering Chemotherapy and cancer therapy, Nitrate vasodilators (nitroglycerin), Antidepressants (SSRIs and SNRIs). Each entry below gives the mechanism as the cited reference states it, the direction the risk runs, how serious that reference treats it, and what to actually do about it — which is, in every case, a conversation with the clinician or pharmacist who manages the prescription rather than a decision you make alone.
What it is. GlyNAC is a nutritional supplement combining two amino acids, glycine and N-acetylcysteine (NAC, a precursor of cysteine), that together supply the building blocks the body needs to synthesize glutathione, its most abundant intracellular antioxidant. Glutathione levels and synthesis decline with age, and this deficiency has been linked to elevated oxidative stress and mitochondrial dysfunction, two proposed drivers of aging.
Where it sits on the evidence. Magellan grades the supplement itself as Emerging evidence, with a typical studied dose of 2.4-7.2 g/day total glycine + NAC, the range tested in human trials in older adults. That grade is about whether it works, not about whether it is safe alongside your medication — the two questions are independent, and this page answers only the second.
Products this covers: GlyNAC (Glycine + NAC).
How the risks cluster. The entries split across 2 different mechanisms — opposing; additive — and they are not managed the same way, so read each one rather than assuming a single rule covers all of them.
Safety and efficacy are separate questions, and this page only answers the first. For the second, the study Magellan’s coverage of NAC and GlyNAC rests on is:
“GlyNAC supplementation improved glutathione deficiency, oxidative stress, mitochondrial dysfunction, inflammation, physical function and multiple hallmarks of aging in older adults.”
A strong result does not make a supplement safe alongside your prescription, and a documented interaction does not mean the supplement does not work. Magellan grades those two things separately, and neither grade moves for a commission.
Magellan’s Medication Safety Check runs entirely on your device — type the medicines you take and it flags every documented interaction in this dataset. Nothing you type is sent anywhere.
Open the Medication Safety Check →Because some chemotherapy drugs work by generating free radicals to kill cancer cells, high-dose antioxidants like NAC could theoretically blunt their effectiveness; oncologist consultation is advised before use during active cancer treatment.
Medicines in this group include: Methotrexate (Trexall, Otrexup), Tamoxifen (Nolvadex), Cisplatin, Doxorubicin (Adriamycin), Vincristine (Oncovin), Bortezomib (Velcade), Cyclophosphamide (Cytoxan).
NAC combined with nitroglycerin produces an added vasodilation effect, which in human use has caused severe headaches and can further lower blood pressure.
Medicines in this group include: Nitroglycerin (Nitrostat, Nitro-dur), Isosorbide mononitrate (Imdur), Isosorbide dinitrate (Isordil).
Animal studies suggest NAC may increase the effects of these antidepressants, but clinical relevance in humans has not been established.
Medicines in this group include: Sertraline (Zoloft), Fluoxetine (Prozac), Escitalopram (Lexapro), Citalopram (Celexa), Paroxetine (Paxil), Venlafaxine (Effexor), Duloxetine (Cymbalta), Desvenlafaxine (Pristiq) and 3 more.
These are the warning signs that go with the medication classes on this page. They are general safety-netting, not a prediction that any supplement will cause them.
If something feels seriously wrong, do not wait for an appointment. Call 911 (US) or your local emergency number.
Severity describes the interaction as the cited reference frames it, not how a specific person will react. A “minor” entry in someone with kidney disease, on five other drugs, can matter more than a “major” one in someone on nothing else.
This is a curated set of interactions with citations — not an exhaustive pharmacology database. An interaction that is absent here has not been ruled out; it may simply not be documented in the references Magellan curates from. Supplements are also not batch-tested for identity or contamination the way prescription drugs are, so what is on the label is a claim rather than a guarantee. And most of these entries come from case reports and mechanistic work rather than randomized trials, which is exactly why the sensible response is a pharmacist review rather than either alarm or dismissal.
9 documented interactions across 9 supplements.
43 documented interactions across 24 supplements.
8 documented interactions · shares a drug class with NAC and GlyNAC.
7 documented interactions · shares a drug class with NAC and GlyNAC.
4 documented interactions · shares a drug class with NAC and GlyNAC.
4 documented interactions · shares a drug class with NAC and GlyNAC.
The mechanism and the research behind the compound itself.
The mechanism and the research behind the compound itself.
A–Z of every supplement and drug class in this dataset, plus how to read an interaction.
What the research actually shows, graded independently of affiliate commissions.
Not without checking with the prescriber or pharmacist first. Magellan's dataset grades this as a moderate interaction: Because some chemotherapy drugs work by generating free radicals to kill cancer cells, high-dose antioxidants like NAC could theoretically blunt their effectiveness; oncologist consultation is advised before use during active cancer treatment. (Source: N-Acetylcysteine | Memorial Sloan Kettering Cancer Center.)
3 interactions are documented in Magellan's curated dataset: 2 moderate, 1 minor. They cover Chemotherapy and cancer therapy, Nitrate vasodilators (nitroglycerin), Antidepressants (SSRIs and SNRIs). Absence from this list is not proof of safety — it means no interaction is documented in the references we curate from.
Magellan lists the typical studied dose as: 2.4-7.2 g/day total glycine + NAC, the range tested in human trials in older adults. Dose matters for interactions — several of the entries on this page describe effects that only appear at supplemental rather than dietary intakes.